Why is precision still the most exclusive and inaccessible rune tree to specialize in?
Precision keystones have been made so exclusive to ADC by the fact that you can only get starting attack speed, that even other ADC are forced to take things like comet and kleptomancy instead. Why are 3 other rune trees so generalized and balanced around the existence of ADC but Precision itself will never be easy to access for say a champion like Azir or a number of bruisers who don't synergize with just starting attack speed because Riot doesn't want to balance the keystones again in case they end up being too strong on said champions?
Kleptomancy had it's gold values changed almost exclusively because of Ezreal and Gangplank(and still needs to give less gold overall), Phase Rush is balanced around the existence of melee champions and bruisers even though it's in sorcery and is absolutely core on a number of mages(Nasus and Darius have better options). Why won't Riot open up Precision keystones to other people besides mainly core ADC users? Riot said new runes were meant to give more freedom and choice but there is no choice in being forced to take attack speed with a side of attack speed.

off the top of my head